US6465813B2 - Carbon nanotube device - Google Patents

Carbon nanotube device Download PDF

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Publication number
US6465813B2
US6465813B2 US09270825 US27082599A US6465813B2 US 6465813 B2 US6465813 B2 US 6465813B2 US 09270825 US09270825 US 09270825 US 27082599 A US27082599 A US 27082599A US 6465813 B2 US6465813 B2 US 6465813B2
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carbon nanotube
device
carbon
bundle
carbon nanotubes
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Expired - Fee Related
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US09270825
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US20020020841A1 (en )
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Ji Soon Ihm
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SK Hynix Inc
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SK Hynix Inc
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L51/00Solid state devices using organic materials as the active part, or using a combination of organic materials with other materials as the active part; Processes or apparatus specially adapted for the manufacture or treatment of such devices, or of parts thereof
    • H01L51/05Solid state devices using organic materials as the active part, or using a combination of organic materials with other materials as the active part; Processes or apparatus specially adapted for the manufacture or treatment of such devices, or of parts thereof specially adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential- jump barrier or surface barrier multistep processes for their manufacture
    • H01L51/0504Solid state devices using organic materials as the active part, or using a combination of organic materials with other materials as the active part; Processes or apparatus specially adapted for the manufacture or treatment of such devices, or of parts thereof specially adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential- jump barrier or surface barrier multistep processes for their manufacture the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or swiched, e.g. three-terminal devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B82NANOTECHNOLOGY
    • B82YSPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y10/00Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L29/00Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof; Multistep manufacturing processes therefor
    • H01L29/02Semiconductor bodies ; Multistep manufacturing processes therefor
    • H01L29/12Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
    • H01L29/16Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic System
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L29/00Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof; Multistep manufacturing processes therefor
    • H01L29/66Types of semiconductor device ; Multistep manufacturing processes therefor
    • H01L29/68Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
    • H01L29/70Bipolar devices
    • H01L29/72Transistor-type devices, i.e. able to continuously respond to applied control signals
    • H01L29/73Bipolar junction transistors
    • H01L29/735Lateral transistors
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H01L51/00Solid state devices using organic materials as the active part, or using a combination of organic materials with other materials as the active part; Processes or apparatus specially adapted for the manufacture or treatment of such devices, or of parts thereof
    • H01L51/0032Selection of organic semiconducting materials, e.g. organic light sensitive or organic light emitting materials
    • H01L51/0045Carbon containing materials, e.g. carbon nanotubes, fullerenes
    • H01L51/0048Carbon nanotubes
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11CSTATIC STORES
    • G11C2213/00Indexing scheme relating to G11C13/00 for features not covered by this group
    • G11C2213/10Resistive cells; Technology aspects
    • G11C2213/17Memory cell being a nanowire transistor
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S977/00Nanotechnology
    • Y10S977/70Nanostructure
    • Y10S977/734Fullerenes, i.e. graphene-based structures, such as nanohorns, nanococoons, nanoscrolls or fullerene-like structures, e.g. WS2 or MoS2 chalcogenide nanotubes, planar C3N4, etc.
    • Y10S977/742Carbon nanotubes, CNTs
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S977/00Nanotechnology
    • Y10S977/70Nanostructure
    • Y10S977/734Fullerenes, i.e. graphene-based structures, such as nanohorns, nanococoons, nanoscrolls or fullerene-like structures, e.g. WS2 or MoS2 chalcogenide nanotubes, planar C3N4, etc.
    • Y10S977/742Carbon nanotubes, CNTs
    • Y10S977/743Carbon nanotubes, CNTs having specified tube end structure, e.g. close-ended shell or open-ended tube
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S977/00Nanotechnology
    • Y10S977/84Manufacture, treatment, or detection of nanostructure
    • Y10S977/842Manufacture, treatment, or detection of nanostructure for carbon nanotubes or fullerenes

Abstract

Transistor, is disclosed, including a base having a bundle of (n,n) nanotubes, and an emitter and a collector connected to opposite sides of the base each having (n,m, n−m≠3l) nanotubes, whereby substantially reducing a device size and improving an operation speed as the carbon nanotube has a thermal conductivity much better than silicon.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a transistor, and more particularly, to a junction type transistor of carbon nanotubes.

2. Discussion of the background Art

There are a horizontal, and vertical types in background art junction type transistors. The background art junction transistor will be explained with reference to the attached drawings. FIG. 1a illustrates a plane view of the background art junction transistor and FIG. 1b illustrates a sectional view of the background art junction transistor.

Referring to FIGS. 2a and 2 b, there is a background art PNP junction transistor having an n type epitaxial layer 2 isolated by a silicon oxide film 3 formed on a substrate 1. There are p type impurity regions 4 and 5 at fixed intervals in the n type epitaxial layer 2, wherein the p type impurity region 4 serves as a collector of a transistor and the p type impurity region 5 serves as an emitter of the transistor.

The aforementioned background art junction transistor has the following problems.

The limitation in fabrication of the background art transistor that an NPN transistor fabrication as well as circuit integration should be done on the same time, a geometry of the background art transistor is not optimal for preventing electron-hole couplings and collecting holes at collectors in a base.

Second, the comparatively high doping concentration in the collector with a thick depletion layer in the base degrades a performance, and conduction of additional diffusion in an effort to overcome such demerit results in a complicated fabrication process.

Third, even though the vertical type junction transistor fabricated in an effort for solving the aforementioned background art problems of the transistor may more or less help in an improvement of the performance, the fabrication of vertical type junction transistor requires significant cost increase and effort since it requires totally different fabrication process.

SUMMARY OF THE INVENTION

Accordingly, the present invention is directed a transistor that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.

An object of the present invention is to provide a transistor having carbon nanotubes which has improved performances and simple fabrication process.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, the transistor of carbon nanotubes includes a base having a bundle of (n,n) carbon nanotubes, and an emitter and a collector having (n,m, n−m≠3l) nanotubes connected to opposite sides of the base respectively.

A single carbon nanotube has a diameter not greater than approximately 1 nm, is metallic or semiconductive depending on atomic array of the carbon in the tube, and can be doped with p type impurities, but not with n type impurities.

A bundle of a few tens of metallic carbon nanotubes forms a so called pseudo gap with an electron and a hole present on the same time. Upon application of a bias to such a nanotube bundle, electrons or holes are caused to enter more or to enter less even if not doped with impurities.

Accordingly, in the transistor of carbon nanotubes of the present invention, a bundle of carbon nanotube is used as a base part of the transistor, one single line or a few lines of carbon nanotubes are used as the emitter and the collector, respectively.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention:

In the drawings:

FIG. 1a illustrates a plane view of the background art junction transistor;

FIG. 1b illustrates a sectional view of the background art junction transistor;

FIG. 2 illustrates an atomic array of a metallic carbon nanotube of the present invention;

FIG. 3 illustrates an atomic array of a semiconductive carbon nanotube of the present invention; and,

FIG. 4 illustrates a transistor of carbon nanotubes in accordance with a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. FIG. 2 illustrates an atomic array of a metallic carbon nanotube of the present invention, FIG. 3 illustrates an atomic array of a semiconductive carbon nanotube of the present invention, and FIG. 4 illustrates a PNP junction type transistor of carbon nanotubes in accordance with a preferred embodiment of the present invention.

The carbon nanotubes are classified into metallic carbon nanotubes and semiconductive carbon nanotubes according to an atomic array in the carbon nanotube. As shown in FIG. 2, a single line of the metallic carbon nanotube has a hexagonal pattern of an atomic array of the carbons at a 90° to a tube axis. That is, the metallic carbon nanotube is, in technical term, called as (n,n) nanotube or armchair nanotube. The “n” represents an integer denoting a size, and the two characters are the same, the tubes have the same properties with only difference in their diameters. In general, the (n,n) carbon nanotubes are (10,10) carbon nanotubes.

And, as shown in FIG. 3, a semiconductive carbon nanotube has a hexagonal pattern of an atomic array of the carbons at, not a 90°, but slightly sloped(smaller than 90°), to a tube axis. The aforementioned semiconductive carbon nanotube is called in technical term as (n,m) (n−m≠3l) carbon nanotubes. That is, the “n” and “m” should not be a multiple of 3, for example (10,0) or (11,0) carbon nanotube is a specific example, with an energy gap of 1 eV.

The transistor in accordance with one preferred embodiment of the present invention, of carbon nanotubes having the aforementioned properties is shown in FIG. 4. That is, as explained, a base part in the transistor includes a bundle of metallic carbon nanotube. The bundle has diameter x width at least 5 nm×6 nm. An emitter part in the transistor includes one single line or a few lines of semiconductive carbon nanotubes of large energy gap doped with “p” type impurity(for example, boron). Finally, a collector in the transistor includes one single line or a few lines of semiconductive carbon nanotubes of large energy gap doped with “p” type impurity (for example, boron) at a concentration lighter than the emitter. And, an electrode of a metal or metallic carbon nanotube is formed at a middle of a base region, the one bundle of carbon nanotubes, and, electrodes are also formed at ends of the emitter and the collector. In the aforementioned transistor of the present invention formed thus, unlike the background art transistor, the base region has no depletion region because the base region is not formed by an artificial doping, and, instead, acts similar to a kind of battery because an energy level of the base region either rises or drops depending on a net charge of entire base region.

The operation of the aforementioned transistor of carbon nanotube of the present invention will be explained.

Basic operation of the transistor of carbon nanotube of the present invention is the same with the background art transistor. However, the transistor of carbon nanotube of the present invention differs slightly due to unusual electric properties of the carbon nanotube bundle in the base. When an orderly direction operation is explained, though a background art transistor can provide a good performance(reducing a leakage current and having a high gain) only when a voltage VEB between the emitter and the base is a little bit positive(for example, 0.7 volt), the transistor of carbon nanotube of the present invention can provide a good performance only when the voltage VEB between the emitter and the base is a little bit negative, because, as an energy gap in the base is actually approximately “0”, the little bit negative voltage VEB should be applied to the emitter and the base for setting up an energy level positively when holes enter into the base. In this instance, a slight reduction of an absolute value of the voltage VEB between the emitter and the base, which has a negative value, has an effect identical to a slight increase of a voltage VEB of an orderly direction between an emitter and a base in the background art transistor. When the absolute value of the voltage VEB between the emitter and the base, which has a negative value, is reduced slightly, a number of holes in the base is reduced slightly. This is identical to a slight provision of electrons to the base through a terminal connected to the base, with a consequential attraction of holes in the emitter toward the base, which produces a current gain. Alike the background art transistor, a strong reverse bias is applied between the base and the collector. If this is taken for a case when the emitter and the base are connected in common, since holes in the emitter is strongly attracted toward the collector, an emitter current IE and a collector current IC are almost the same like the background art transistor. Therefore, a resistance between the base and the collector is significantly higher than a resistance between the emitter and the base, producing a voltage gain and a power gain.

The aforementioned transistor of carbon nanotube of the present invention has the following advantages.

First, though the impossibility of n type doping into a carbon nanotube impede fabrication of transistor of carbon nanotube, the present invention embodies a PNP transistor using an unusual electric properties of carbon nanotube bundle.

Second, as the transistor of carbon nanotube has a size not greater than approx. 1 nanometer, a size of a device can be reduced to about 1/100 in length and about 1/10,000 in an occupied area.

Third, the formation of a transistor of carbon nanotubes having a thermal conductivity significantly higher than silicon can improve operation speed.

Fourth, the operation voltage of the transistor of carbon nanotube much lower than a silicon transistor can reduce a power consumption.

Fifth, the possibility of utilizing a metallic carbon nanotube as an electrode for applying a power to a transistor can reduce the fabrication process.

It will be apparent to those skilled in the art that various modifications and variations can be made in the transistor of the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims (19)

What is claimed is:
1. A nanotube device, comprising:
at least one first carbon nanotube having (n, m, n−m≠3l);
a bundle of carbon nanotubes coupled to the at least one first carbon nanotube;
at least one second carbon nanotube having (n, m, n−m≠3l) coupled to the bundle, wherein the at least one first carbon nanotube, the bundle of carbon nanotubes and the at least one second carbon nanotube are connected for a conduction path between the at least one first and second carbon nanotubes.
2. The device of claim 1, wherein the bundle of carbon nanotubes are (n, n) carbon nanotubes.
3. The device of claim 1, wherein the bundle of carbon nanotubes are metallic carbon nanotubes.
4. The device of claim 1, wherein the at least one first carbon nanotube and the at least one second carbon nanotube are semiconductor carbon nanotubes (CN).
5. The device of claim 1, wherein the at least one first carbon nanotube least one second carbon nanotube include one or two lines of (n, m, n−m≠3l) carbon nanotubes.
6. The device of claim 1, wherein the at least one first carbon nanotube and least one second carbon nanotube and the bundle of carbon nanotubes are coupled to receive power.
7. The device of claim 1, wherein the at least one first carbon nanotube, the at least one second carbon nanotube and the bundle of carbon nanotubes are for connection one of metallic carbon nanotubes or metal electrodes.
8. The device of claim 1, wherein the bundle has a diameter and width approximately 5 nm×6 nm, respectively.
9. The device of claim 1, wherein the at least one first carbon nanotube and the at least one second carbon nanotube are doped with “p” type impurity.
10. The device of claim 1, wherein the at least one first carbon nanotube and the at least one second carbon nanotube are doped with “p” type impurity at first and second concentrations, respectively, and wherein the first concentration si higher than the second concentration.
11. The device of claim 1, wherein a reverse bias voltage is applied between the at least one first carbon nanotube and the at least one second carbon nanotube.
12. The device of claim 1, wherein a first prescribed voltage is applied between the at least one second carbon nanotube and the bundle of carbon nanotubes, and wherein a second prescribed voltage is applied between the at least one first carbon nanotube and the bundle of carbon nanotubes.
13. The device of claim 12, wherein the first and second prescribed voltages are negative voltages, and wherein the second prescribed voltage is larger than the first prescribed voltage.
14. The device of claim 12, wherein the at least one second carbon nanotube and the at least one first carbon nanotube are coupled together through a second conduction path.
15. The device of claim 14, wherein first ends of the at least one first carbon nanotube and the at least one second carbon nanotube are coupled to the bundle of carbon nanotubes in the conduction path, wherein first and second voltage sources supply the first and second prescribed voltage, wherein second ends of the at least one first carbon nanotube and the at least one second carbon nanotube are coupled together through at a node, wherein the node is coupled to the bundle of carbon nanotubes to form the second conduction path.
16. The device of claim 14, wherein a reduction of an absolute value of the first prescribed voltage causes a current gain in the conduction path, wherein a first current flows in the at least one second carbon nanotube in the conduction path and a second current flows in the at least one first carbon nanotube in the conduction path.
17. The device of claim 16, wherein the first and second currents are approximately the same.
18. The device of claim 17, wherein a first resistance between the bundle of carbon nanotubes and the at least one first carbon nanotube is higher than a second resistance between the at least one second carbon nanotube and the bundle of carbon nanotubes.
19. The device of claim 16, wherein a reduction of an absolute value of the first prescribed voltage causes a current gain in the conduction path.
US09270825 1998-06-16 1999-03-18 Carbon nanotube device Expired - Fee Related US6465813B2 (en)

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KR19980022588A KR100277881B1 (en) 1998-06-16 Transistor
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